Device and method for winding deflection yoke with wire

ABSTRACT

Using a nozzle unit (32), a guide unit (33) and a holder unit (35), the nozzle unit (32) having a nozzle (36) for feeding a flat linear member (W) and positioning mechanism (38) for positioning the nozzle, the guide unit (33) having a guide member (82) adapted to engage and guide the linear member (W) and positioning mechanism (73) for positioning the guide member, the holder unit (35) holding removably the deflection yoke (H) for winding thereon of the linear member (W) and capable of rotating the deflection yoke about the axis of the yoke, the guide member (82) is brought into engagement at a corner portion of a winding path with the linear member (W) fed from the nozzle (36) thereby allowing the linear member to be bent and around the deflection yoke (H) and while the linear member (W) is wound once around the deflection yoke (H), the deflection yoke is rotated 360 degrees about the axis thereof and at the same time the nozzle (36) is rotated in the same direction as the rotating direction of the deflection yoke to prevent excess twist.

FIELD OF ART

The present invention relates to a winding method and equipment wherebya flat linear member can be wound automatically, without being twisted,around a deflection yoke used in a cathode-ray tube such as Braun tube.

BACKGROUND ART

In winding a linear member around a deflection yoke (also called abobbin) it is necessary that the linear member be wound orderly alongwinding grooves formed in the deflection yoke. However, if the linearmember used is circular in section, it is dispersed and becomes unstablepositionally, thus resulting in that overlap of the linear member is aptto occur. Once there occurs overlap, the winding thickness of the linearmember increases and therefore the diameter of the deflection yoke mustbe increased accordingly, thus causing lose of the deflectionefficiency.

In view of the point mentioned above, it has recently been proposed touse a flat linear member having a flat section. In this case, there isused a flat linear member having a width matching the width of eachwinding groove formed in a deflection yoke, and by merely stacking thelinear member at the same place it is possible to wind it around thedeflection yoke in an orderly manner without dispersion.

Examples of the flat linear member include such a flat linear memberassembly W1 as shown in FIG. 22A, which is obtained by assembling andfusion-bonding linear members 11 of a circular section into a flatshape, and such a flat linear member assembly W2 as shown in FIG. 22B,which is obtained by assembling and fusion-bonding linear members 12 ofa square section into a flat shape.

When a linear member is wound round a deflection yoke, a single windingthereof causes the linear member to be twisted once. Winding of a flatlinear member is as shown in a conceptual diagram of FIG. 23. As showntherein, when a flat linear member W is wound round a deflection yoke,it is bent at four corner portions and is twisted 90 degrees at each ofthe corner portions. It follows that one round results in a twist of 360degrees of the linear member W about its longitudinal axis. This twistgives rise to no special problem in the use of a linear member having acircular section, but must be eliminated in the case of winding a flatlinear member in an orderly manner.

Automatic winding of a linear member around a deflection yoke alsorequires the twist eliminating work.

The present invention has solved the above conventional problem. It isan object of the invention to permit a flat linear member as adeflecting coil to be wound automatically around a deflection yokewithout causing twist of the linear member.

It is another object of the present invention to realize automaticwinding of a flat linear member in high efficiency and high accuracywithout causing twist of the linear member.

It is a further object of the present invention to utilize the equipmentand method of the invention for wide-angle deflection or for improvingthe deflection efficiency of high-frequency scan.

DISCLOSURE OF THE INVENTION

According to the present invention there is provided a winding equipmentfor a deflection yoke to be used for winding a flat linear memberthrough first and second circumferential grooves formed in thedeflection yoke and through winding grooves formed between the first andsecond circumferential grooves, the winding equipment comprising anozzle unit, a guide unit and a holder unit, the nozzle unit having anozzle for feeding the flat linear member, positioning means forpositioning the nozzle, and rotating means for rotating and positioningthe nozzle at least 180 degrees around the longitudinal axis of thelinear member, the guide unit having a guide member adapted to engageand guide the linear member, positioning means for positioning the guidemember, and rotating means for rotating the guide member at least 90degrees to bend the linear member at each corner portion, the holderunit functioning to hold removably the deflection yoke for windingthereon of the linear member and index the deflection yoke around itsaxis and capable of rotating the deflection yoke in a predeterminedcertain direction.

According to the present invention there also is provided a windingmethod for a deflection yoke to wind a flat linear member through firstand second circumferential grooves formed in the deflection yoke andthrough winding grooves formed between the first and secondcircumferential grooves, the method uses a nozzle unit having a nozzlefor feeding the flat linear member and positioning means for positioningthe nozzle, a guide unit having a guide member adapted to engage thelinear member to guide the linear member and positioning means forpositioning the guide member, and a holder unit holding removably thedeflecting unit for winding thereon of the linear member and capable ofrotating the deflection yoke about its axis, and the method compriseswinding the linear member onto the deflection yoke held by the holderunit while allowing the guide member to engage the linear member at eachcorner portion of a winding path to bend the linear member, and rotatingthe deflection yoke 360 degrees about its axis and turning the nozzle inthe same direction as the rotating direction of the deflection yokewhile the linear member is wound once around the deflection yoke, toprevent the linear member from being twisted to excess.

Since the guide member is turned 90 degrees at a corner portion of thewinding path, the linear member is twisted 90 degrees and is bentnaturally at the corner portion.

When the flat linear member is wound through the first and secondcircumferential grooves formed in the deflection yoke and through thewinding grooves formed between both circumferential grooves, the flatlinear member is bent and thereby twisted 90 degrees at each of fourcorner portions. That is, a one-round winding of the linear membercauses a twist of 360 degrees of the linear member about itslongitudinal axis. In this case, if the deflection yoke is turned 360degrees during one-round winding of the linear member, the linear memberwill be untwisted. At this time, excess twist is prevented by rotatingthe nozzle in the same direction as the rotating direction of thedeflection yoke.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a winding equipment according to anembodiment of the present invention;

FIG. 2 is a perspective view of a deflection yoke for winding;

FIG. 3 is a sectional view thereof;

FIG. 4 is a perspective view of an XZ feed unit used in the embodiment;

FIG. 5 is a perspective view of a nozzle unit used in the embodiment;

FIG. 6 is a front view of a nozzle rotating unit used in the embodiment;

FIG. 7 is a perspective view of a front end portion of a stopper used inthe embodiment;

FIG. 8 is a sectional view of a nozzle used in the embodiment;

FIG. 9 is a perspective view of a guide unit used in the embodiment;

FIG. 10 is a perspective view of a front end portion of a guide memberused in the embodiment;

FIG. 11 is a sectional view of a holder body used in the embodiment;

FIG. 12 is a perspective view of a clamp portion and a clampopening/closing portion both used in the embodiment;

FIG. 13 is a sectional view showing a clamped state of the deflectionyoke in the embodiment;

FIG. 14 is a perspective view of a clamp opening/closing device used inthe embodiment;

FIG. 15 is a block diagram showing a control system used in theembodiment;

FIG. 16 is a flow chart showing operations of the control system used inthe embodiment;

FIG. 17 is an explanatory diagram of a winding step in the embodiment;

FIG. 18 is an explanatory diagram of a winding step in the embodiment;

FIG. 19 is an explanatory diagram of a winding step in the embodiment;

FIG. 20 is an explanatory diagram of a winding step in the embodiment;

FIG. 21 is an explanatory diagram of a winding step in the embodiment;

FIGS. 22A and 22B are perspective views of flat linear memberassemblies; and

FIG. 23 is a conceptual diagram showing in what state a flat linearmember is wound round a deflection yoke.

BEST MODE FOR PRACTICING THE INVENTION

The present invention will be described in more detail hereinunder withreference to the accompanying drawings.

The structure of a deflection yoke will first be described withreference to FIGS. 2 and 3 which are a perspective view and a sectionalview, respectively, of the deflection yoke. The deflection yoke,indicated at H, is horn-shaped and has an opening side 13 of a largediameter and a neck side 14 of a small diameter. The deflection yoke His also called an integral type section deflection yoke or bobbin orseparator. It plays the role of a spool used as the core of winding andis formed of a plastic material for example. The deflection yoke H ismounted to a Braun tube in such a manner that its opening side 13 islocated on the fluorescent screen side and its neck side 14 ispositioned on the electron gun side.

The opening side 13 of the deflection yoke H has a plurality of sectionsS1, a plurality of winding grooves 15 formed by the sections S1, and asingle opening-side circumferential groove (first circumferentialgroove) 16. Likewise, the neck side 14 of the deflection yoke F has aplurality of sections S2, a plurality of winding grooves 17 formed bythe sections S2 and connected to the winding grooves 15, and a singleneck-side circumferential groove (second circumferential groove) 18.Further, an opening-side flange 19 and a neck-side flange 20 areprojected from the deflection yoke H.

FIG. 1 is a perspective view of a winding equipment according to anembodiment of the present invention. As shown in the same figure, thewinding equipment is provided with a nozzle unit 32 mounted on a baseunit 31, a guide unit 33, a tensioner unit 34 and a holder unit 35.

The nozzle unit 32 has a nozzle 36, a nozzle rotating unit 37 as meansfor rotating and positioning the nozzle 36, and an XZ feed unit 38 asmeans for positioning the nozzle 36.

The XZ feed unit 38, as shown in FIG. 4 which is a perspective view ofthe same unit, has an X-axis slide unit 39 and a Z-axis slide unit 40.The X-axis slide unit 39 is fixed to the base unit 31, and the Z-axisslide unit 40 is supported by the X-axis slide unit 39 slidably inX-axis direction. A feed screw 41 of the X-axis slide unit 39 is rotatedby means of a servo motor 42, whereby the Z-axis slide unit 40 ispositioned in X-axis direction. Likewise, a slider 43 is supported bythe Z-axis slide unit 40 slidably in Z-axis direction (verticaldirection perpendicular to X axis), and a feed screw 44 of the Z-axisslide unit 40 is rotated by means of a servo motor 45, whereby theslider 43 is positioned in Z-axis direction.

The nozzle rotating unit 37 (not shown in FIG. 4) is fixed to the slider43 and it can be brought into a desired position in the XZ plane by theabove-mentioned movements in X- and Z-axis directions. The servo motors42 and 45 are controlled their operation by an NC section 151 throughservo drivers, as will be described later.

FIG. 5 is a perspective view of the nozzle unit 32 and FIG. 6 is a frontview of the nozzle rotating unit 37. The nozzle unit 32 is for feedingthe flat linear member W from the tensioner unit 34 to the deflectionyoke H. The nozzle 36 is fixed to a hollow shaft 51, and the shaft 51 issupported rotatably by a slide base 54 through a bearing 53 housedwithin a bearing housing 52. A toothed belt 57 is entrained on all of atoothed pulley 50 fixed to the shaft 51, a toothed pulley 55 fixed to aservo motor 58 and an idler 56 located at an intermediate position. Uponoperation of the servo motor 58 the nozzle 36 can turn in the range ofat least 180 degrees about the vertical axis (the longitudinal axis ofthe linear member W in the nozzle 36).

A stopper 59 is for clamping the linear member W in a sandwiching mannerbefore the linear member enters the nozzle 36 when the winding equipmentis not in operation. The stopper 59 has a pneumatic cylinder 60 fixed tothe slide base 54, a clamp pin 61 and a fixed pin 62 both shown in FIG.7. The clamp pin 61 is fixed to a piston shaft of the pneumatic cylinder60. As the piston shaft of the pneumatic cylinder 60 moves forward orbackward, the liner member W is sandwiched and clamped between the clamppin 61 and the fixed pin 62 or is released. The servo motor 58 and thepneumatic cylinder 60 are controlled their operation by the NC section151 as will be described later.

Above the stopper 59 is disposed a linear member guide unit 63, and arotating member 64, through which the linear member W is inserted, issupported rotatably by bearings 65, as shown in FIG. 6. According tothis construction, the flat linear member W is guided into the nozzle 36while being rotated in response to the rotation of the nozzle 36.

The nozzle 36, as shown in longitudinal section in FIG. 8, has a hollowrod-like nozzle body 66, with a pair of guide rollers 67 being supportedrotatably at the lower end of the nozzle body 66. As shown in FIG. 6,the linear member W fed from the tensioner unit 34 passes a guide pulley68, then passes through the interior of the linear member guide unit 63and that of the stopper 59, further through the shaft 51, and enters thenozzle 36. The linear member W now in the nozzle 36 passes through theinterior of the nozzle 36 and is sent out to the exterior while beingheld between the paired guide rollers 67 located at the lower end of thenozzle, as shown in FIG. 8. At this time, the nozzle 36 turns, where bythe linear member W is twisted about its longitudinal axis or isuntwisted.

On the base unit 31, as shown in FIG. 1, the guide unit 33 is disposedin an opposed relation to the nozzle unit 32. As shown in FIG. 9, theguide unit 33 has a guide operating portion 71 for operating a guidemember 82, a rotating unit 72 as rotating means for rotating the guidemember 82, and an XZ feed unit 73 as positioning means for positioningthe guide member 82.

The XZ feed unit 73 is of the same construction as the XZ feed unit 38of the nozzle unit 32 described previously and it has an X-axis slideunit 74 and a Z-axis slide unit 75. The XZ feed unit 73 can position aslide base 76 (see FIG. 9) of the Z-axis slide unit 75 to a desiredposition in the XZ plane. Also in this case there are provided servomotors 69 and 70 (see FIG. 1) for moving the slide base 76 in X- andZ-axis directions. The servo motors 69 and 70 are controlled theiroperation by the NC section 151 through servo drivers as will bedescribed later.

As shown in FIG. 9, the rotating unit 72, which is mounted on the slidebase 76, has a rotary base 77, a bearing housing 78, a rotary shaft 79,a coupling 80, and a rotary actuator 81.

The bearing housing 78 is fixed to the slide base 76, and one end of therotary shaft 79 which is supported rotatably in the bearing housing 76is fixed to the rotary base 77. The other end of the rotary shaft 79 isconnected through the coupling 80 to the rotary actuator 81 which isfixed to the slide base 76. Therefore, the rotary base 77 is rotated byoperation of the rotary actuator 81. The rotary actuator 81 is apneumatic actuator and is controlled its operation by the NC section151.

The guide operating portion 71 of the guide unit 33 has a guide member82, a drive cylinder 83 and a base 84. The base 84 is fixed to therotary base 77 of the rotating unit 72.

The guide member 82 is adapted to engage the linear member W to guidethe linear member. As shown in FIG. 9, the guide member 82 is supportedon the base 84 pivotably through a pin 85. At a front end of a stemportion 86 of the guide member 82 is formed a turned square U-shapedhook 87. As shown in FIG. 10, the hook 87 has a linear guide bar 88having a length approximately equal to the width of the flat linearmember W. The guide bar 88 is positioned so that the axis of the stemportion 86 intersects substantially the center of the guide bar lengthat right angles.

The drive cylinder 83 is supported at the rear portion thereof by thebase 84 pivotably through a pin 89, and the front end of a piston shaft90 is connected to the base end portion of the guide member 82 pivotallywith a pin 91.

As the piston shaft 90 of the drive cylinder 83 advances, the guidemember 82 moves pivotally around the pin 85 in the clockwise directionin FIG. 9 and assumes an operating position (the position shown in FIG.9) in which it is straight in the longitudinal direction of the base 84.In this state, the stem portion 86 of the guide member 82 issubstantially coaxial with the rotary shaft 79. On the other hand, asthe piston shaft 90 of the drive cylinder 83 retreats, the guide member82 moves pivotally in the counterclockwise direction and the hook 87assumes a position retracted from the axis of the rotary shaft 79. Thedrive cylinder 83 is also controlled its operation by the NC section 151as will be described later.

The nozzle 36 of the nozzle unit 32 and the guide member 82 of the guideunit 33 can be moved and positioned without mutual interference insubstantially the same XZ plane.

As shown in FIG. 1, the tensioner unit 34 is, mounted on a frame 92. Thelinear member W enters the tensioner unit 34 from a linear member supplysource (not shown) and is thereby given an appropriate tensionmechanically, then is fed to the nozzle unit 32.

Now, a description will be given of the holder unit 35. The holder unit35 holds removably and indexes the deflection yoke H shown in FIG. 2 andcan rotate the deflection yoke in a certain direction for untwisting thelinear member W. As shown in FIG. 1, the holder unit 35 is positioned infront of the nozzle unit 32 and the guide unit 33 which are opposed toeach other.

The holder unit 35 has a holder body 93 for clamping the deflection yokeH and positioning it to a desired rotational angle position and a clampopening/closing device 94 disposed below the holder body 93 to open andclose a clamp portion 102 of the holder body 93.

As shown in FIG. 1, the holder body 93 has an annular rotary table 96supported rotatably by a support plate 95 of L-shaped section which iserected on the base unit 31. The rotary table 96 is connected to arotating shaft of a servo motor 97 through a toothed belt 98 and can bepositioned to a desired rotational angle position by operation of theservo motor 97. The servo motor 97 is also controlled its operation bythe NC section 151 via a servo driver as will be described later.

FIG. 11 is a sectional view of the holder body 93. As shown in the samefigure, a rotary ring 100 is supported by the support plate 95 rotatablythrough a bearing 99, and the rotary table 96 for carrying thedeflection yoke H thereon is fixed onto the upper surface of the rotaryring 100. A toothed pulley 101 is fixed to the lower surface of therotary ring 100, and the toothed belt 98 connected to the servo motor 97is engaged with the toothed pulley 101. On the lower surface side of thetoothed pulley 101 is disposed a clamp portion 102 for clamping thedeflection yoke H removably.

Direct-acting bearings 103 are fitted in two holes formed in the toothedpulley 101, and connecting shafts 104 of the clamp portion 102 arerespectively inserted through the bearings 103 slidably, whereby theclamp portion 102 is connected to the toothed pulley 101. Therefore,upon operation of the servo motor 97, the clamp portion 102 is alsorotated and positioned together with the rotary table 96 through thetoothed pulley 101.

A clamp spring 106, which is wound round each connecting shaft 104, ispositioned between each of fixing plates 105 for fixing the connectingshaft 104 and the toothed pulley 101. The clamp portion 102 is urgeddownward at all times by virtue of the clamp spring 106. A stopper 107is projected from the upper end of each connecting shaft 104. Thelower-end position of the connecting shaft 104 is restricted by abutmentof the stopper with an end portion of the associated direct-actingbearing 103.

FIG. 12 is a perspective view of the clamp portion of the holder body 93and an opening/closing portion 124 of the clamp opening/closing device94. As shown in the same figure, the two fixing plates 105 are connectedto the toothed pulley 101 through the connecting shafts 104 and theysupport guide shafts 108. The guide shafts 108 are spaced in parallelfrom each other. A pair of support bases 109 are slidably supported bythe guide shafts 108 so as to straddle both guide shafts 108 and movablytoward and away from each other. A roller mount 110 and a cam plate 111are fixed to each support base 109.

Two rollers 112 are supported rotatably by each roller mount 110 in sucha manner that a total of four rollers 112 are positioned on acircumference and come into abutment with the outer peripheral surfaceof the deflection yoke H. Rotating shafts of the two rollers 112 on eachroller mount 110 are inclined in V shape with respect to each other soas to contact the outer peripheral surface of the deflection yoke H andeffect positioning of the yoke.

Outside each support base 109 a pair of guide shafts 113 (a pair ofguide shafts 113 on one side are not shown in FIG. 12) extend in adirection orthogonal to the guide shafts 108 and are supported by thetoothed pulley 101 through support means (not shown). A plate springslider 114 is mounted slidably to the guide shafts 113, and a camfollower 116 is fixed to the plate spring slider 114 through a platespring 115. The cam follower 116 is adapted to engage the cam plate 111which is fixed to the support base 109.

The cam plate 111 has an inclined cam surface 117 of a graduallyincreasing cam lift and a retaining cam surface 118 of a V-shapedsection. When the plate spring slider 114 is located on this side of thecam plate 111 in FIG. 12 and when it is moved in the direction of arrow"a" along the guide shafts 113, the cam follower 116 comes into abutmentwith the inclined cam surface 117 of the cam plate 111. Then, with themovement of the plate spring slider 114, the cam plate 111 and thesupport base 109 move inwards (in the direction in which both supportbases 109 approach each other). With further movement of the platespring slider 114, the cam follower 116 gets in the retaining camsurface 118 of the cam plate 111 and is retained there.

When the deflection yoke H is interposed between the rollers 112 of bothsupport bases 109, the rollers 112 abut the deflection yoke H torestrict the movement of the yoke as long as each cam follower 116 isfitted in the associated retaining cam surface 118. In this state, theplate springs 115 are deflected and their biasing forces cause therollers 112 to be urged against the deflection yoke H (see FIG. 13).

On the other hand, FIG. 14 is a perspective view of the clampopening/closing device 94. As shown in the same figure, the clampopening/closing device 94 is provided with a fixed portion 121, avertical moving unit 122, a rising table 123, and an opening/closingportion 124.

The fixed portion 121 is fixed to the base unit 31 shown in FIG. 1. Thevertical moving unit 122 has a moving plate 125 which is supported bythe fixed portion 121 so as to be slidable vertically (in the Z-axisdirection), and a cylinder 126 which is fixed to the fixed portion 121.A piston shaft 127 of the cylinder 126 is fixed to the moving plate 125.The rising table 123 is fixed to the upper end of the moving plate 125and faces the upper surface of the base unit 31. The opening/closingportion 124 is mounted on the rising table 123. Therefore, as a pistonshaft 127 of the cylinder 126 extends, the rising table 123 and theopening/closing portion 124 rise a predetermined distance in the Z-axisdirection together with the moving plate 125 and are positioned. Thecylinder 126 is controlled its operation by the NC section 151 whichwill be described later.

In the opening/closing portion 124 mounted on the rising table 123, asshown in FIG. 12, a pair of linear guides 128 for holding levers arefixed onto the rising table 123, and holding levers 129 are supportedslidably by the linear guides 128. When the toothed pulley 101 isindexed to a predetermined mounting/removing position (the state shownin FIG. 12), the linear guides 128 assumes positions under the guideshafts 113 of the plate spring sliders 114 to guide the holding levers129 in a direction parallel to the moving direction of the sliders 114.

A holding lever drive cylinder 130 is fixed to the rising table 123.Piston shafts 131 of the drive cylinder 130 are connected through aconnecting rod 132 to the holding levers 129 located on both sides. Asthe piston shafts 131 advance or retreat, the holding levers 129 locatedon both sides move together with the linear guides 128 while beingguided by the linear guides.

The holding levers 129 are each turned square U-shaped in section whichis open upward so that the lower portion of the plate spring slider 114can be fitted inside the turned square U-shape removably. By operationof the drive cylinder 130 the holding levers 129 are moved along thelinear guides 128 in accordance with the position of the plate springsliders 114, and the rising table 123 is raised a predetermineddistance, whereby the lower portions of the sliders 114 are respectivelyfitted in the holding levers 129. When the holding levers 129 are movedin this state by means of the drive cylinder 130, the plate springsliders 114 also move. The drive cylinder 130 is controlled itsoperation by the NC section 151 which will be described later.

On the rising table 123, a linear guide 133 for actuator pins is fixedbetween the paired linear guides 128, the linear guide 133 extending ina direction orthogonal to the linear guides 128. Sliders 135 withactuator pins 134 fixed thereto are supported slidably by the linearguide 133. Further, an actuator pin drive cylinder 136 is fixed to therising table 123 in an adjacent relation to the linear guide 133. Bothsliders 135 are connected to the drive cylinder 136 and are moved indirections approaching or leaving each other by operation of the drivecylinder 136. When the toothed pulley 101 is indexed to a predeterminedmounting/removing position (the state shown in FIG. 12), both sliders135 are respectively positioned under the support bases 109 and move inparallel with the moving direction of the support bases.

Recesses (not shown) for fitting therein of both actuator pins 134removably are formed in the lower surfaces of both support bases 109. Byoperation of the drive cylinder 136 the sliders 135 are moved along thelinear guide 133 in accordance with the position of the support bases109. When the rising table 123 is raised a predetermined distance, theactuator pins 134 fixed to the sliders 135 get into the recesses formedin the support bases 109. As the sliders 135 are moved by means of thedrive cylinder 136, the support bases 109 move in directions approachingor leaving each other. The drive cylinder 136 is controlled itsoperation by the NC section 151 which will be described later.

To the rising table 123 is fixed a spring pusher 138 with pushpins 137fixed to both ends thereof. When the toothed pulley 101 is indexed to apredetermined mounting/removing position, both push pins 137 arerespectively positioned under the fixing pins 105. When the rising table123 is raised a predetermined distance, the push pins 137 come intoabutment with the bottoms of the fixing plates 105 and cause the fixingplates (clamp portion 102) to rise against the biasing force of theclamp springs 106.

As shown in FIG. 13 which represents a clamped state of the deflectionyoke H, the deflection yoke has the opening-side flange 19 and theneck-side flange 20. The deflection yoke H is inserted into a hole 139formed in the rotary table 96 of the holder body 93, and the lowersurface of the opening-side flange 19 is placed on the peripheral edgeof the rotary table 96. The size of the hole 139 is set so that theneck-side flange 20 can pass therethrough. A lug (not shown) is formedon the rotary table 96 at a position near the flange 19 and it is fittedin a recess formed in the opening-side flange 19 to restrict therotation of the rotary table 96.

The deflection yoke H is mounted to the holder body 93 in the followingmanner. When the deflection yoke H is to be inserted into the rotarytable 96, both support bases 109 are moved away from each other inadvance so that the four rollers 112 are retracted up to positions notinterfering with the neck-side flange 20. As to the plate spring sliders114, they are retracted up to positions where the cam followers 116 donot contact the cam plates 111. These retracting motions are performedrespectively by operation of the actuator pins 134 and that of theholding levers 129 in the opening/closing portion 124.

In this state the deflection yoke H is inserted into the rotary table96. Subsequently, the rising table 123 is raised, so that the fixingplates 105 are pushed up with push pins 137 of the pusher 138, wherebythe whole of the clamp portion 102 is raised relative to the rotarytable 96. As a result, the lower surfaces of the roller mounts 110 arepositioned higher than the neck-side flange 20 of the deflection yoke H.At the same time, the holding levers 129 are fitted on the plate springsliders 114, and the actuator pins 134 get into the recesses formed inthe lower surfaces of the support bases 109.

Next, the support bases 109 are moved toward each other by the actuatorpins 134, and the plate spring sliders 114 are moved by the holdinglevers 129, allowing the cam followers 116 to get in the retaining camsurfaces 118 of V-shaped section of the cam plates 111. Thereafter, therising table 123 is moved down, thus causing the push pins 137 to moveaway from the fixing plates 105, with the result that the clamp portion106 is pushed down in the direction of arrow R in FIG. 13 by virtue ofthe clamp springs 106, and the roller mounts 110 are abutted against theflange 20 and urge it downward. At the same time, the holding levers 129and the actuator pins 134 move respectively away from the plate springsliders 114 and the support bases 109. Now, the clamping for thedeflection yoke H is completed.

In the clamped state as shown in FIG. 13, the rotary table 96 and theroller mounts 110 come into abutment respectively with the flanges 19and 20 of the deflection yoke H and are urged in directions away fromeach other by means of the clamp springs 106 and are thereby positionedin the vertical direction (central axis CH of the deflection yoke H, thefirst direction). Further, the four rollers 112 come into pressurecontact with an outer peripheral portion 144 of the deflection yoke H infour directions to effect positioning in the horizontal direction (thesecond direction) orthogonal to the central axis CH.

After the deflection yoke H has been clamped as described above, theopening/closing portion 124 of the clamp opening/closing device 94leaves the clamp portion 102 of the holder body 93, so that thedeflection yoke H can be positioned to a desired angular position byoperating the servo motor 97 to rotate the rotary table 96.

Since the four rollers 112 are arranged so that V shape is defined byeach of two sets of rollers, all the rollers 112 can contact the outerperipheral surface of the deflection yoke H. The reason why four rollers112 are used is that it is intended to uniform deformations induced by alarge clamping force in the case where the deflection yoke H is made ofa synthetic resin. Basically, therefore, it suffices to use a total ofthree rollers which are a pair of rollers arranged in V shape and oneroller opposed thereto. For example, where the deflection yoke H islarger in size and its cylindrical portion is large in diameter andsmall in wall thickness, there may be used five or more rollers.

For removing the deflection yoke H from the holder body 93 there isadopted a procedure reverse to the procedure described above. That is,the clamp portion 102 is raised with push pins 137 to disengage theroller mounts 110 and the flange 20 from each other, then the supportbases 109 are moved away from each other with actuator pins 134, and theplate spring sliders 114 are moved by the holding levers 129, allowingthe cam followers 116 to be disengaged from the cam plates 111. As aresult, the deflection yoke H becomes free and can be removed from therotary table 96.

Further, the servo motors 42,45 and 58 in the nozzle unit 32, the servomotors 69 and 70 for XZ movement in the guide unit 33, and the servomotor 97 for rotation in the ho der unit 35, are numerically controlledby the NC section 151 respectively through lines and servo drivers, asshown in FIG. 15.

The cylinders 60, 83, 126, 130, 136 and rotary actuator 81 in the aboveunits are numerically controlled through a pneumatic drive system 152also by using outputs from the NC section 151. The operations of thecylinders 60, 57, 80, 114, 119 and rotary actuator 81 are detected bysensors 153 provided respectively for them, and the detected signals arefed back to the NC section 151.

To the NC section 151 are inputted NC data beforehand from a teachingunit 154 to control the winding operations required. The NC data thusinputted can be changed their parameters by inputting modification datafrom the teaching unit 154, whereby the change of NC data to cope with achange in type of a deflection yoke for winding a linear member thereoncan be done easily.

In the NC section 151 of the above construction, as shown in the flowchart of FIG. 16, the nozzle unit 32, guide unit 33 and holder unit 35are moved to their target positions by controlling the associated servomotors appropriately, and their cylinders are operated to drive theclamp portion 102, guide member 82, etc. When the sensors associatedwith those cylinders have detected that the operations of the cylinderswere carried out surely, the operations of the cylinders are stopped.The operations required are now completed.

Although in the above illustrated embodiment the plate spring sliders114 shown in FIG. 12 are used for generating the clamping force of therollers 112, the plate spring sliders 114 may be substituted by, forexample, compression springs or tension springs. Likewise, the toothedbelt 98 and pulley 101 used for rotating the deflection yoke H togetherwith the rotary table 96 may be substituted by gears or friction wheels.Further, there may be adopted a direct drive using a special motorprovided with a hollow rotor which correspond, to the pulley 101.

Although in the above embodiment the servo motors and cylinders arenumerically controlled by the NC section 151, this constitutes nolimitation. The control may be made by any other similar means, forexample, by a combination of sequencer and AC servo motor or acombination of CPU and robot controller.

Description is now directed to an example of a method for winding theflat linear member W around the deflection yoke H, using the windingequipment described above. Along the winding path the linear member Wpasses one section S1 on the opening side 13 of the deflection yoke Hshown in FIG. 2, then passes through the winding grooves 15 and 17 andreaches section S2 on the neck side 14 [(a) in FIG. 23]. Next, thelinear member W is bent at a corner portion, passes the neck-sidecircumferential groove 18 and is wound up to the next section S2 on theneck side 14 [(b) in FIG. 23]. Then, the linear member W is bent at acorner portion, passes the section S2 and further through the windinggrooves 15 and 17 and reaches section S1 on the opening side [(c) inFIG. 23]. Next, the linear member W is bent at a corner portion, passesthe opening-side circumferential groove 16 and returns to the originalsection S1 [(d) in FIG. 23]. Further, the linear member W is bent at acorner portion and returns to the initial position. By repeating thiscycle the linear member W is wound round the deflection yoke H.

First, as shown in FIG. 17, the nozzle 36 is brought down and the linearmember W is wound along the winding grooves 15 and 17. The lower end ofthe nozzle 36 is projected below the neck side 14 of the deflection yokeH. In this state, the guide member 82 is positioned opposedly to thelinear member W which is exposed from below the winding groove 17 to thelower end of the nozzle 36, and it is then turned to its operatingposition, allowing its hook 87 to be engaged with the linear member W.

Next, as shown in FIG. 18, the guide member 82 is retreated whilepulling the linear member W and is turned 90 degrees by means of therotary actuator 81 to twist the linear member 90 degrees so that thelinear member extends along the neck-side circumferential groove 18. Theguide member 82 is then raised up to the height of the groove 18.Subsequently, the deflection yoke H is rotated while the linear member Wis guided by the guide member 82, allowing the linear member W to bewound round the groove 18 up to the position of the next section S2.

When the linear member W has reached the section S2, the guide member 82is further turned 90 degrees to twist the linear member by 90 degrees.At the same time, the nozzle 36 is raised to guide the linear member Wto the winding groove 17. In this process, the guide member 82 turns toits retracted position and is disengaged from the linear member W. FIG.19 shows this state, in which the linear member W which has left thenozzle 36 is in a 180 degree -twisted state.

Next, the deflection yoke H is rotated 360 degrees in the linear memberuntwisting direction, and at the same time the nozzle 36 is also rotated180 degrees in the same direction as the deflection yoke H. The 360degree rotation of the deflection yoke H results in the linear member Wbeing twisted 180 degrees in the opposite direction, but this twist iseliminated by the 180 degree rotation of the nozzle 36 in the samedirection as the deflection yoke H.

Then, as shown in FIG. 20, the nozzle 36 is moved to the outer peripheryside of the deflection yoke H while it is raised, allowing the linearmember W to be wound along the winding grooves 17 and 15. In this state,the guide member 82 is again engaged with the linear member W.

As shown in FIG. 21, the nozzle 36 is moved to the central side of thedeflection yoke H, and the guide member 82 is retreated while pullingthe linear member W and is turned 90 degrees to twist the linear member90 degrees, thus allowing the linear member to extend along theopening-side circumferential groove 16. The guide member 82 is thenbrought down to the height of the groove 16. Subsequently, thedeflection yoke H is turned in its returning direction while the linearmember is guided by the guide member 82, allowing the linear member tobe wound along the opening-side circumferential groove 16 up to theposition of the next section S1. At the same time, the nozzle 36 isturned 90 degrees in the direction to eliminate the 90 degree twistwhich has been formed by the rotation of the guide member 82.

When the linear member has reached the next section S1, the guide member82 is further turned 90 degrees to twist the linear member 90 degrees.At the same time, the nozzle 36 is inserted into the deflection yoke Hand the linear member W is guided to the winding groove 15. In thisprocess, the guide member 82 turns to its retracted position and isdisengaged from the linear member W. Further, the nozzle 36 is turned 90degrees in the direction to eliminate the 90 degree twist of the linearmember which has been formed by the rotation of the guide member 82.

In this way the linear member W is wound once round the deflection yokeH and reverts to the state shown in FIG. 17. By subsequent repetition ofthe above cycle the linear member W is wound along the winding path onthe deflection yoke H.

The concrete motions of the nozzle 36, the guide member 82, the rotarytable 96, etc. in the above embodiment are simplified illustrations forexplanation and the method of the invention is not limited thereto. Forexample, it is possible to let the nozzle 36 perform a more complicatedmotion in order to facilitate the engagement and disengagement betweenthe guide member 82 and the linear member W.

In the above embodiment, while the linear member W is wound once roundthe deflection yoke H, the deflection yoke is rotated 360 degrees aboutits axis when the linear member W sent out from the nozzle 36 has beentwisted 180 degrees, and at the same time the nozzle 36 is turned 180degrees in the same direction as the deflection yoke, then the nozzle isturned back twice by an angle of 90 degrees each time. However, thisconstitutes no limitation. In the method of the present invention, whenthe deflection yoke H is rotated 360 degrees, the nozzle 36 is turned tominimize excess twist, thereby adjusting the twist of the linear memberW. In the linear member winding process, the 360 degrees rotation timingof the deflection yoke H, as well as the timing and amount of rotationof the nozzle 36, can be selected suitably.

For example, a modification may be made in such a manner that when thelinear member W is first twisted 90 degrees, the nozzle 36 is turned 90degrees in the untwisting direction, then upon subsequent 90 degreetwist of the linear member, the deflection yoke H is turned 360 degreesin the untwisting direction and at the same time the nozzle 36 is turned180 degrees in the same direction as the deflection yoke (opposite tothe untwisting direction), then when the linear member W is twisted 90degrees, the nozzle 36 is turned 90 degrees in the untwisting direction.

As the flat linear member, such linear member assemblies W1 and W2 asshown in FIGS. 22A and 22B, obtained by assembling a plurality of linearmembers into a flat shape, are employable suitably, but it goes withoutsaying that not only such flat linear member assemblies but also asingle flat linear member is employable.

The deflection yoke H is not limited to such an integral type as in theabove embodiment. Even for a single deflection yoke H fabricated bycombining two deflection yoke halves, winding of the linear member canbe done according to the present invention.

INDUSTRIAL APPLICABILITY

As set forth above, the deflection yoke winding equipment and method ofthe present invention are employable as coil winding equipment andmethod for not only the deflection yoke used in the ordinary type of acathode-ray tube but also to the deflection yokes used in a wide-angledeflection type cathode-ray tube and a high-frequency scan typecathode-ray tube.

I claim:
 1. A winding method for a deflection yoke to be used forwinding a flat linear member through first and second circumferentialgrooves formed in the deflection yoke and through winding grooves formedbetween said first and second circumferential grooves,the method using anozzle unit having a nozzle for feeding the flat linear member andpositioning means for positioning said nozzle, a guide unit having aguide member adapted to engage and guide the linear member andpositioning means for positioning said guide member and a holder unitholding removably the deflection yoke for winding thereon of the flatlinear member and adapted to rotate the deflection yoke about the axisof the yoke, said method comprising winding the flat linear member ontothe deflection yoke held by said holder unit while said guide memberengages the flat linear member at each corner portion of a winding pathto bend the flat linear member, and rotating the deflection yoke 360degrees about the axis of the yoke and turning said nozzle in the samedirection as the rotating direction of the defection yoke while thelinear member is wound once around the deflection yoke to preventtwisting.
 2. The winding method according to claim 1, wherein while theflat linear member is wound once around the deflection yoke and when theflat linear member fed from said nozzle has been twisted 180 degrees,the deflection yoke is rotated 360 degrees about the axis thereof andthe nozzle is rotated 180 degrees in the same direction as the rotatingdirection of the deflection yoke, thereafter the nozzle is returned toits original position from said 180 degrees rotation thereof.
 3. Awinding method for winding flat linear member around a deflection yoketo be wound with the flat linear member through first and secondcircumferential grooves formed in the deflection yoke and throughwinding grooves formed between said first and second circumferentialgrooves, said method comprising steps of:first step for feeding saidflat linear member from a nozzle in a nozzle unit and attaching anextremity of said flat linear member to the deflection yoke, saiddeflection yoke being held removably by a holder unit; second step forlowering said nozzle by means of a positioning means of the nozzlethereby to wind said flat linear member along a winding groove andallowing a lower end of said nozzle to project below the deflectionyoke; third step for engaging the flat linear member exposed from thelower end of the winding groove to the lower end of said nozzle by aguide member, said guide member being positioned opposedly to said theflat linear member, retreating said guide member while pulling said flatlinear member, turning said guide member 90 degrees by means of arotating means of said guide member to twist said flat linear member,and raising said guide member up to a height of said firstcircumferential groove by means of a positioning member of guide member;fourth step for rotating said deflection yoke by means of the holderunit while guiding said flat linear member by means of said guidemember, thereby to allow said flat linear member to be wound around saidfirst circumferential groove; fifth step for further turning said guidemember 90 degrees by means of said rotating means of said guide memberto twist said flat linear member and, at the same time, raising saidnozzle by means of said positioning means of said nozzle while turningsaid guide member to its retracted position and disengaging said guidemember from said flat linear member; sixth step for rotating saiddeflection yoke 360 degrees about an axis of the deflection yoke in adirection that said flat linear member is untwisted and, at the sametime, turning said nozzle in the same direction as said deflection yoke;seventh step for moving said nozzle to an outer periphery side of thedeflection yoke while raising said nozzle above upper end of saiddeflection yoke, thereby to allow said flat linear member to be woundalong another winding groove, and engaging again the flat linear memberexposed from the upper end of said another winding groove to the lowerend of said nozzle by said guide member, said guide member being raisedduring said sixth step, retreating said guide member while pulling saidflat linear member, turning said guide member 90 degrees by means ofsaid rotating means of said guide member to twist said flat linearmember, and lowering said guide member to a height of said secondcircumferential groove by means of said positioning member of said guidemember; eighth step for rotating said deflection yoke by means of theholder unit against the rotational direction of deflection yoke in saidfourth step while guiding said flat linear member by means of said guidemember, thereby to allow said flat linear member to be wound around saidsecond circumferential groove, and then turning said nozzle in adirection that the twist of the flat linear member formed by therotation of guide member during said seventh step is eliminated; andninth step for further turning said guide member 90 degrees by means ofsaid rotating means of said guide member to twist said flat linearmember and, at the same time, lowering said nozzle to insert it intosaid deflection yoke by means of said positioning means of said nozzlewhile turning said guide member to its retracted position anddisengaging said guide member from said flat linear member, and thenturning said nozzle in a direction that the twist of the flat linearmember formed by the rotation of guide member during this step iseliminated.
 4. The winding method according to claim 3, wherein when theflat linear member fed from said nozzle is twisted 180 degrees, thedeflection yoke is rotated 360 degrees about the axis thereof and thenozzle is rotated 180 degrees in the same direction as the rotatingdirection of the deflection yoke during said sixth step, and then, insaid eighth and ninth steps, the nozzle is returned respectively by 90degrees.
 5. A winding method for winding flat linear member around adeflection yoke to be wound with the flat linear member through firstand second circumferential grooves formed in the deflection yoke andthrough winding grooves formed between said first and secondcircumferential grooves, said method comprising steps of:first step forfeeding said flat linear member from a nozzle in a nozzle unit andattaching an extremity of said flat linear member to the deflectionyoke, said deflection yoke being held removably by a holder unit; secondstep for lowering said nozzle by means of a positioning means of thenozzle, thereby to wind said flat linear member along a winding grooveand allowing a lower end of said nozzle to project below the deflectionyoke; third step for engaging the flat linear member exposed from thelower end of the winding groove to the lower end of said nozzle by aguide member, said guide member being positioned opposedly to said theflat linear member, retreating said guide member while pulling said flatlinear member, turning said guide member 90 degrees by means of arotating means of said guide member to twist said flat linear member,raising said guide member up to a height of said first circumferentialgroove by means of a positioning member of said guide member, and thenturning said nozzle in a direction that the twist of the flit linearmember formed by the rotation of said guide member during this step iseliminated; fourth step for rotating said deflection yoke by means ofthe holder unit while guiding said flat linear member by means of saidguide member, thereby to allow said flat linear member to be woundaround said first circumferential groove; fifth step for further turningsaid guide member 90 degrees by means of said rotating means of saidguide member to twist said flat linear member and, at the same time,raising said nozzle by means of positioning means of said nozzle whileturning said guide member to its retracted position and disengaging saidguide member from said flat linear member; sixth step for rotating saiddeflection yoke 360 degrees about an axis of the deflection yoke in adirection that said flat linear member is untwisted and, at the sametime, turning said nozzle in the same direction as said deflection yoke;seventh step for moving said nozzle to an outer periphery side of thedeflection yoke while raising said nozzle above upper end of saiddeflection yoke, thereby to allow said flat linear member to be woundalong another winding groove, and engaging again the flat linear memberexposed from the upper end of said another winding groove to the lowerend of said nozzle by said guide member, said guide member being raisedduring said sixth step, retreating said guide member while pulling saidflat linear member, turning said guide member 90 degrees by means ofsaid rotating means of said guide member to twist said to a flat linearmember, and lowering said guide member height of said secondcircumferential groove by means of said positioning member of said guidemember; eighth step for rotating said deflection yoke by means of theholder unit against the rotational direction of deflection yoke in saidfourth step while guiding said flat linear member by means of said guidemember, thereby to allow said flat linear member to be wound around saidsecond circumferential groove; and ninth step for further turning saidguide member 90 degrees by means of said rotating means of guide memberto twist said flat linear member and, at the same time, lowering saidnozzle to insert it into said deflection yoke by means of saidpositioning means of said nozzle while turning said guide member to itsretracted position and disengaging said guide member from said flatlinear member, and then turning said nozzle in a direction that thetwist of the flat linear member formed by the rotation of guide memberduring this step is eliminated.
 6. The winding method according to claim5, wherein when the flat linear member fed from said nozzle is twisted180 degrees, the nozzle is rotated 90 degree in the untwisting directionin the third step, the deflection yoke is rotated 360 degrees about theaxis thereof and the nozzle is rotated 180 degrees in the same directionas the rotating direction of the deflection yoke during said sixth step,and then, the nozzle is rotated 90 degrees in the untwisting directionin said ninth steps.